Multi-connected air conditioning system

Abstract

The invention relates to the technical field of air conditioning systems, and discloses a multi-connected air conditioning system which comprises a compressor. An outdoor heat exchanger; the indoor heat exchange module comprises an indoor shell and an indoor heat exchange unit arranged in the indoor shell, the indoor heat exchange unit communicates with the outdoor heat exchanger through a third refrigerant pipeline, and the economizer is arranged on the third refrigerant pipeline and used for supercooling a refrigerant flowing into the indoor heat exchange unit; the liquid storage element comprises a liquid storage tank, a first liquid storage pipeline and a second liquid storage pipeline, the first liquid storage pipeline and the second liquid storage pipeline are communicated with the liquid storage tank, the first liquid storage pipeline is communicated between the outdoor heat exchanger and the liquid storage tank, the second liquid storage pipeline is communicated between the liquid storage tank and the indoor heat exchange unit, and a first supercooling inflow pipeline is communicated between the first liquid storage pipeline and the economizer.

Description

Technical Field

[0001] This application relates to the field of air conditioning system technology, for example to a multi-split air conditioning system. Background Technology

[0002] With the development of science and technology and the improvement of people's living standards, air conditioners have been widely used, and people's requirements for air conditioners are getting higher and higher, and the performance of air conditioners is constantly being optimized.

[0003] When users have different functional needs for different rooms, multi-split air conditioning systems can meet their diverse functional requirements. For example, all rooms can cool simultaneously; all rooms can heat simultaneously; some rooms can cool while others heat; or reheat and dehumidify. Typically, the indoor modules of a multi-split air conditioning system have two heat exchangers to achieve these multiple functions.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art: The outdoor heat exchanger of a multi-split air conditioning system has limited subcooling regulation capability, which in turn affects the cooling efficiency of the air conditioning system under different operating conditions.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a multi-split air conditioning system that solves the problem that the outdoor heat exchanger of a multi-split air conditioning system has limited subcooling adjustment capability, which in turn affects the cooling efficiency of the air conditioning system under different operating conditions.

[0008] In some embodiments, a multi-split air conditioning system includes: a compressor; an outdoor heat exchanger; an indoor heat exchange module including an indoor housing and an indoor heat exchange unit disposed within the indoor housing, the indoor heat exchange unit being connected to the outdoor heat exchanger via a third refrigerant pipeline, the indoor heat exchange unit including a first heat exchange unit and a second heat exchange unit, the first heat exchange unit including a first heat exchanger and a first expansion valve connected to the first heat exchanger, the second heat exchange unit including a second heat exchanger and a second expansion valve connected to the second heat exchanger; an economizer disposed in the third refrigerant pipeline for subcooling the refrigerant flowing into the indoor heat exchange unit; and a liquid storage element including a liquid storage tank and a first liquid storage pipeline and a second liquid storage pipeline connecting to the liquid storage tank, wherein the first liquid storage pipeline is connected between the outdoor heat exchanger and the liquid storage tank, the second liquid storage pipeline is connected between the liquid storage tank and the indoor heat exchange unit, and a first subcooling inflow pipeline is connected between the first liquid storage pipeline and the economizer.

[0009] In some alternative embodiments, the first liquid storage pipeline includes a first liquid storage pipe section connected between the third refrigerant pipeline and the first subcooling inflow pipeline, and a second liquid storage pipe section connected between the first subcooling inflow pipeline and the liquid storage tank, wherein the first liquid storage pipe section is provided with a first throttling element and the second liquid storage pipe section is provided with a second throttling element.

[0010] In some alternative embodiments, the second liquid storage line is provided with a third throttling element; the section of the third refrigerant line between the outdoor heat exchanger and the first liquid storage line is provided with a system throttling element.

[0011] In some optional embodiments, the multi-split air conditioning system further includes a controller configured to: acquire the current subcooling of the outdoor heat exchanger; if the current subcooling is less than or equal to a first target subcooling, reduce the opening of the system throttling element; if the current subcooling is greater than the first target subcooling and less than or equal to a second target subcooling, reduce the opening of the first throttling element to allow low-temperature refrigerant to flow into the economizer to subcool the refrigerant in the third refrigerant line; if the current subcooling is greater than the second target subcooling, reduce the opening of the third throttling element to allow low-temperature refrigerant in the receiver tank to enter the third refrigerant line.

[0012] In some optional embodiments, if the current subcooling is greater than the first target subcooling and less than or equal to the second target subcooling, the method further includes: reducing the opening of the second throttling element and closing the third throttling element to replenish the low-temperature refrigerant in the storage tank.

[0013] In some optional embodiments, if the current subcooling degree is greater than the second target subcooling degree, the opening of the third throttling element is reduced. The method further includes: if the amount of refrigerant stored in the liquid tank is less than or equal to the minimum liquid storage amount, the third throttling element is closed and the opening of the first throttling element is reduced, so that the economizer subcools the refrigerant in the third refrigerant pipeline.

[0014] In some alternative embodiments, the controller is further configured to: control the refrigerant flowing out of the compressor to flow into the indoor heat exchange unit after passing through the outdoor heat exchanger, and adjust the opening of the first expansion valve to be less than or equal to a first preset opening to frost the first heat exchanger, and adjust the opening of the second expansion valve to be greater than or equal to a second preset opening to reheat the second heat exchanger.

[0015] In some alternative embodiments, the controller is also configured to control the refrigerant flowing out of the compressor to flow into the outdoor heat exchanger after passing through the indoor heat exchange unit, thereby defrosting the first heat exchanger and cleaning it.

[0016] In some alternative embodiments, the compressor includes a first compression cylinder and a second compression cylinder, the first compression cylinder having a first intake port and the second compression cylinder having a second intake port, wherein a first heat exchanger is connected to the second intake port and the second heat exchanger is connected to the first intake port.

[0017] In some alternative embodiments, the first compression cylinder is a low-pressure cylinder and the second compression cylinder is a medium-pressure cylinder.

[0018] The multi-split air conditioning system provided in this embodiment can achieve the following technical effects: A multi-split air conditioning system includes a compressor, an outdoor heat exchanger, and an indoor heat exchange module. The indoor heat exchange module includes a first heat exchanger and a second heat exchanger. A first expansion valve is used to throttle the refrigerant flowing into the first heat exchanger, and a second expansion valve is used to throttle the refrigerant flowing into the second heat exchanger.

[0019] Furthermore, the multi-split air conditioning system also includes an economizer and a liquid receiver. The economizer is located in the third refrigerant line and is used to subcool the refrigerant flowing into the indoor heat exchange unit. The liquid receiver includes a liquid tank and a first liquid receiver line and a second liquid receiver line connecting to the liquid tank. The first liquid receiver line connects the outdoor heat exchanger and the liquid tank, and the second liquid receiver line connects the liquid tank and the indoor heat exchange unit. A first subcooling inflow line connects the first liquid receiver line to the economizer.

[0020] In this way, the refrigerant temperature in the third refrigerant line can be adjusted simultaneously using an economizer and a liquid receiver, which improves the ability to regulate subcooling and thus improves the cooling efficiency of the air conditioning system under different operating conditions.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of a multi-split air conditioning system provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of another multi-split air conditioning system provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of another multi-split air conditioning system provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of another multi-split air conditioning system provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of an indoor heat exchange module provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of a moisture-absorbing module provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of another moisture-absorbing module provided in an embodiment of this disclosure; Figure 8 This is a schematic diagram of another moisture-absorbing module provided in an embodiment of this disclosure; Figure 9 This is a schematic diagram of another moisture-absorbing module provided in an embodiment of this disclosure; Figure 10 This is a schematic diagram of another moisture-absorbing module provided in an embodiment of this disclosure.

[0023] Figure label: 10. Compressor; 11. First compression cylinder; 12. Second compression cylinder; 20. Oil separator; 21. First gas-liquid separator; 22. Second gas-liquid separator; 30. Indoor heat exchange unit; 31. First heat exchanger; 32. Second heat exchanger; 33. Four-way valve; 34. Three-way valve; 351. Top of first heat exchanger; 352. Bottom of first heat exchanger; 40. Outdoor heat exchanger; 41. First refrigerant line; 42. Second refrigerant line; 43. Third refrigerant line; 44. First return line; 45. Second return line; 50. Outdoor fan; 61. First expansion valve; 62. Second expansion valve; 63. System throttling element; 70. Indoor fan; 8. Moisture-absorbing module; 81. First roller; 82. Second roller; 83. Absorbent cotton cloth; 831. First moisture-absorbing part; 832. Second moisture-absorbing part; 84. Supporting abutment; 85. Spray housing; 851. Nozzle; 86. Pull cord; 91. Economizer; 92. Liquid storage tank; 921. First liquid storage pipeline; 922. Second liquid storage pipeline; 93. First throttling element; 94. Second throttling element; 95. Third throttling element. Detailed Implementation

[0024] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0025] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0026] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0027] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0028] Unless otherwise stated, the term "multiple" means two or more.

[0029] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0030] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0032] This disclosure provides a multi-split air conditioning system.

[0033] The multi-split air conditioning system includes a compressor 10, an outdoor heat exchanger 40, and an indoor heat exchange module.

[0034] The indoor heat exchange module includes an indoor shell and an indoor heat exchange unit 30 disposed within the indoor shell. The indoor heat exchange unit 30 is connected to the outdoor heat exchanger 40 via a third refrigerant pipe 43. The indoor heat exchange unit 30 includes a first heat exchange unit and a second heat exchange unit. The first heat exchange unit includes a first heat exchanger 31 and a first expansion valve 61 connected to the first heat exchanger 31. The second heat exchange unit includes a second heat exchanger 32 and a second expansion valve 62 connected to the second heat exchanger 32.

[0035] The multi-split air conditioning system also includes an economizer 91 and a liquid storage element. The economizer 91 is installed in the third refrigerant line 43 and is used to subcool the refrigerant flowing into the indoor heat exchange unit 30. The liquid storage element includes a liquid storage tank 92 and a first liquid storage line 921 and a second liquid storage line 922 connecting the liquid storage tank 92. The first liquid storage line 921 connects the outdoor heat exchanger 40 and the liquid storage tank 92, and the second liquid storage line 922 connects the liquid storage tank 92 and the indoor heat exchange unit 30.

[0036] Optionally, a first subcooling inflow pipe is connected between the first liquid storage pipe 921 and the economizer 91. In this way, the low-temperature refrigerant, after heat exchange by the outdoor heat exchanger 40 and throttling and cooling by the system throttling element 63, can flow into the economizer 91 through the first subcooling inflow pipe.

[0037] Optionally, the high-temperature refrigerant in the economizer 91, after heat exchange with the third refrigerant pipeline 43, flows back to the first gas-liquid separator 21 or the second gas-liquid separator 22 via the pipeline.

[0038] like Figure 1As shown in the embodiment of this disclosure, in the multi-split air conditioning system, an economizer 91 is provided in the third refrigerant pipe 43 connecting the outdoor heat exchanger 40 and the indoor heat exchange unit 30. The economizer 91 is used to adjust the subcooling, thereby improving the cooling efficiency of the air conditioning system. Optionally, the economizer 91 includes a plate heat exchanger, etc., which uses a refrigerant with a temperature lower than the saturated liquid temperature after condensation to cool the third refrigerant pipe 43, typically reducing the temperature by 3°C to 5°C. In this way, the subcooling can be increased without changing the amount of refrigerant in the system circulation pipes of the air conditioning system.

[0039] Optionally, the third refrigerant line 43 is also equipped with a liquid storage element. This allows the low-temperature refrigerant, after heat exchange with the outdoor heat exchanger 40 and throttling by the system throttling element 63, to be stored in the liquid storage tank 92. When the economizer 91 alone cannot meet the subcooling demand, the low-temperature refrigerant stored in the liquid storage tank 92 can be directly replenished to the third refrigerant line 43 via the second liquid storage line 922. This achieves rapid cooling of the refrigerant in the third refrigerant line 43, thereby improving the cooling capacity of the air conditioning system.

[0040] As can be seen, in the air conditioning system provided by the embodiments of this disclosure, the economizer 91 and / or liquid storage element can be selectively used for subcooling under different operating conditions, thereby meeting the subcooling requirements under different operating conditions and improving the cooling capacity of the air conditioning system.

[0041] Optionally, the first liquid storage pipeline 921 includes a first liquid storage pipe section connected between the third refrigerant pipeline 43 and the first subcooling inflow pipeline, and a second liquid storage pipe section connected between the first subcooling inflow pipeline and the liquid storage tank 92, wherein the first liquid storage pipe section is provided with a first throttling element 93 and the second liquid storage pipe section is provided with a second throttling element 94.

[0042] like Figure 1 and Figure 2 As shown, the refrigerant flowing out of the outdoor heat exchanger 40 flows into the economizer 91 sequentially through the first liquid storage pipe section and the first subcooling inlet pipe. Optionally, the first liquid storage pipe section is provided with a first throttling element 93, so that the temperature of the refrigerant flowing into the economizer 91 can be adjusted by adjusting the opening of the first throttling element 93, thereby adjusting the subcooling capacity of the economizer 91.

[0043] Optionally, the second liquid storage pipe section is provided with a second throttling element 94, so that the temperature of the refrigerant flowing into the liquid storage tank 92 can be adjusted by adjusting the opening of the second throttling element 94, thereby adjusting the subcooling capacity of the liquid storage tank 92.

[0044] Optionally, the first throttling element 93 includes an electromagnetic expansion valve; the second throttling element 94 includes an electromagnetic expansion valve.

[0045] Optionally, the second liquid storage pipeline 922 is provided with a third throttling element 95; the section of the third refrigerant pipeline 43 between the outdoor heat exchanger 40 and the first liquid storage pipeline 921 is provided with a system throttling element 63.

[0046] The second liquid storage pipe 922, which serves as the outlet pipe of the liquid storage tank 92, is equipped with a third throttling element 95, which can adjust the temperature of the refrigerant flowing out of the liquid storage tank 92.

[0047] Optionally, the third throttling element 95 includes an electromagnetic expansion valve.

[0048] Optionally, a multi-split air conditioning system may also include a controller.

[0049] The controller is configured to: obtain the current subcooling of the outdoor heat exchanger 40, and if the current subcooling is less than or equal to the first target subcooling, reduce the opening of the system throttling element 63.

[0050] If the current subcooling is less than or equal to the first target subcooling, the temperature flowing into the indoor heat exchange module is adjusted only by regulating the opening of the system throttling element 63. At this time, the first throttling element 93, the second throttling element 94, and the third throttling element 95 are fully open and do not perform a throttling function.

[0051] If the current subcooling is greater than the first target subcooling and less than or equal to the second target subcooling, then the opening of the first throttling element 93 is reduced to allow the low-temperature refrigerant to flow into the economizer 91, so as to subcool the refrigerant in the third refrigerant pipeline 43.

[0052] Optionally, the temperature corresponding to the second target subcooling is greater than the temperature corresponding to the first target subcooling. If the current subcooling is greater than the first target subcooling and less than or equal to the second target subcooling, the opening of the first throttling element 93 is reduced, allowing the low-temperature refrigerant to enter the economizer 91 and exert the subcooling effect of the economizer 91. Optionally, in this state, the opening of the second throttling element 94 is reduced, and the third throttling element 95 is closed, allowing the low-temperature refrigerant to flow into the storage tank 92 and be temporarily stored to replenish the low-temperature refrigerant in the storage tank 92.

[0053] Optionally, if the current subcooling is greater than the second target subcooling, the opening of the third throttling element 95 is reduced so that the low-temperature refrigerant in the liquid storage tank 92 enters the third refrigerant pipeline 43.

[0054] For example, under high-temperature refrigeration operation, if the current subcooling is greater than the second target subcooling, it is considered that adjusting the subcooling through the economizer 91 is no longer sufficient to meet the current temperature requirement. Therefore, the opening of the third throttling element 95 is reduced, allowing the low-temperature refrigerant in the liquid storage tank 92 to flow into the third refrigerant pipeline 43, thus rapidly adjusting the temperature of the refrigerant in the third refrigerant pipeline 43.

[0055] If the current subcooling is greater than the second target subcooling, the opening of the third throttling element 95 is reduced. It also includes: if the amount of refrigerant stored in the liquid storage tank 92 is less than or equal to the minimum liquid storage amount, the third throttling element 95 is closed and the opening of the first throttling element 93 is reduced, so that the economizer 91 subcools the refrigerant in the third refrigerant pipeline 43.

[0056] When the refrigerant level in the receiver 92 is less than or equal to the minimum refrigerant level, it is considered that the subcooling capacity of the receiver 92 is largely utilized. At this time, the opening of the first throttling element 93 can be reduced, and the subcooling degree can be finely adjusted using the economizer 91. Simultaneously, the third throttling element 95 is closed to replenish the receiver 92. After replenishment is completed, the third throttling element 95 can be further reduced to start the next cycle of subcooling adjustment using the receiver 92.

[0057] Optionally, the minimum liquid storage volume is 1 / 5 of the total liquid storage volume of storage tank 92.

[0058] Optionally, the indoor shell is provided with an air inlet and an air outlet, wherein the first heat exchanger 31 is located near the air inlet.

[0059] The indoor heat exchange unit 30 includes both a first heat exchanger 31 and a second heat exchanger 32. A first expansion valve 61 is located at the refrigerant inlet of the first heat exchanger 31 to throttle the refrigerant flowing into the first heat exchanger 31. A second expansion valve 62 is located at the refrigerant inlet of the second heat exchanger 32 to throttle the refrigerant flowing into the second heat exchanger 32. Figure 3 As shown.

[0060] By installing two heat exchangers, multi-split air conditioning systems can achieve various operating modes such as reheat dehumidification.

[0061] The multi-split air conditioning system provided in this embodiment of the present disclosure also includes a controller configured to perform self-cleaning of the first heat exchanger 31 and the second heat exchanger 32.

[0062] Compared to the second heat exchanger 32, the first heat exchanger 31 is closer to the air inlet of the indoor shell; it can also be understood that the air entering from the air inlet of the indoor shell first flows through the first heat exchanger 31 and then through the second heat exchanger 32. With this arrangement, dust is more likely to accumulate on the surface of the first heat exchanger 31.

[0063] Optionally, the controller is configured to control the refrigerant flowing from the compressor 10 to flow into the indoor heat exchange unit 30 after passing through the outdoor heat exchanger 40, and to adjust the opening of the first expansion valve 61 to be less than or equal to a first preset opening, causing the first heat exchanger 31 to frost, and to adjust the opening of the second expansion valve 62 to be greater than or equal to a second preset opening, causing the second heat exchanger 32 to reheat. Figure 3As shown.

[0064] The indoor fan 70 can be shut off during the self-cleaning process of the first heat exchanger 31 and / or the second heat exchanger 32. Although the indoor fan 70 is off, the frosting process of the heat exchanger absorbs heat from the air during cleaning. Due to the convection of the air, the user will still feel a noticeable coolness after the frosting process lasts for about ten minutes.

[0065] The multi-split air conditioning system provided in this embodiment adjusts the opening of the first expansion valve 61 to be less than or equal to a first preset opening, so that the evaporation temperature of the first heat exchanger 31 is less than 0°C, causing frost to form on the surface of the first heat exchanger 31. Optionally, the first preset opening is less than or equal to 150 steps.

[0066] Simultaneously, the opening degree of the second expansion valve 62 is adjusted to be greater than or equal to the second preset opening degree, so that the second heat exchanger 32 can be reheated, compensating for the temperature loss of the first heat exchanger 31 during the frosting process. Optionally, the second preset opening degree is greater than the first preset opening degree.

[0067] Understandably, when the first heat exchanger 31 is in the frosting stage, the outdoor fan 50 is turned off and the opening of the system throttling element 63 is adjusted to the maximum, so that the second heat exchanger 32 can better perform its reheating function.

[0068] Optionally, the controller is also configured to control the refrigerant flowing from the compressor 10 to flow through the indoor heat exchange unit 30 and then into the outdoor heat exchanger 40, causing the first heat exchanger 31 to defrost and clean itself. Figure 4 As shown.

[0069] The refrigerant flowing from compressor 10 flows into outdoor heat exchanger 40 after passing through indoor heat exchange unit 30. In this way, the high-temperature refrigerant discharged from compressor 10 can defrost the first heat exchanger 31, which has already undergone frosting. Figure 4 As shown. Once defrosting is complete, the first heat exchanger 31 has undergone one self-cleaning process.

[0070] Optionally, the indoor heat exchange module also includes a moisture absorption module 8, which is disposed between the first heat exchanger 31 and the second heat exchanger 32. The moisture absorption module 8 is used to transfer the defrosting water generated by the defrosting of the first heat exchanger 31 to the second heat exchanger 32 for cleaning the second heat exchanger 32.

[0071] As mentioned earlier, compared to the second heat exchanger 32, the first heat exchanger 31, being closer to the air inlet, accumulates more dust on its surface, while the second heat exchanger 32 accumulates less dust. In the multi-split air conditioning system provided in this embodiment, the first heat exchanger 31, which accumulates more dust, undergoes a self-cleaning process involving frosting followed by defrosting. For the second heat exchanger 32, which accumulates less dust, it is flushed using defrosting water generated during the defrosting process of the first heat exchanger 31. In this way, the first heat exchanger 31 is self-cleaned while the second heat exchanger 32 is also cleaned, improving cleaning efficiency and saving energy.

[0072] Optionally, the moisture-absorbing module 8 includes a moisture-absorbing element, a first roller 81, a second roller 82, and a drive motor, wherein the first end of the moisture-absorbing element is connected to the first roller 81, the second end of the moisture-absorbing element is connected to the second roller 82, and the drive motor is drivenly connected to the first roller 81.

[0073] The moisture-absorbing element includes absorbent cotton cloth 83 with good water absorption properties. The moisture-absorbing element has two ends: a first end connected to a first roller 81 and a second end connected to a second roller 82. Optionally, the moisture-absorbing element comprises two parts: the first part is the absorbent cotton cloth 83, and the second part is a pull cord 86 connected to the absorbent cotton cloth 83. In the initial state where moisture absorption is not required, the absorbent cotton cloth 83 is completely wound around the first roller 81, and the pull cord 86 is tensioned between the first roller 81 and the second roller 82. This ensures that the moisture-absorbing element does not obstruct the airflow between the first heat exchanger 31 and the second heat exchanger 32 in the initial state. Figure 9 As shown.

[0074] The drive motor is connected to the first spool 81. For example, the motor shaft of the drive motor is provided with a drive gear, and the end of the first spool 81 is provided with a driven gear. The drive gear and the driven gear mesh with each other, thereby causing the drive motor to drive the first spool 81 to rotate.

[0075] Optionally, the second spool 82 is driven by another drive motor to drive the second spool 82 to rotate.

[0076] It is understandable that the first or second reel can be driven to wind or unwind by controlling the forward or reverse rotation of the drive motor.

[0077] Optionally, the controller is also configured to: when the first heat exchanger 31 defrosts, control the first reel 81 to unwind and the second reel 82 to rewind, so that the moisture-absorbing element adheres to the surface of the first heat exchanger 31 to absorb the defrosting water of the first heat exchanger 31, and the moisture-absorbing element is in a moisture-absorbing state. Figure 10 As shown.

[0078] When the first heat exchanger 31 is in the defrosting stage, the first roller 81 is unwound and the second roller 82 is wound up, causing the absorbent cloth 83 to adhere to the surface of the first heat exchanger 31 to absorb the defrosting water. When the adhesion time of the absorbent cloth 83 is greater than or equal to the preset water absorption time, it is considered that the absorbent cloth 83 has completed water absorption. Optionally, the preset water absorption time can be 30 seconds to 1 minute.

[0079] Control the first roll 81 to wind up and the second roll 82 to unwind, so that the moisture-absorbing element that has absorbed defrost water is wound up on the first roll 81, and the moisture-absorbing element is in the winding state.

[0080] The first reel 81 is wound up, and the second reel 82 is unwound, so that the moisture-absorbing element with the defrost water is wound up on the first reel 81, and the defrost water released during the winding process is sprayed onto the second heat exchanger 32 to clean the second heat exchanger 32.

[0081] Optionally, the defrosting time of the first heat exchanger 31 can be 10 minutes, and the first roller 81 can be controlled to unwind and rewind multiple times to spray the second heat exchanger 32 multiple times, thereby improving the cleaning effect of the second heat exchanger 32.

[0082] Optionally, the first heat exchanger 31 includes a first heat exchange top end 351 and a first heat exchange bottom end 352, wherein a first roller 81 is disposed at the first heat exchange top end 351 and a second roller 82 is disposed at the first heat exchange bottom end 352.

[0083] like Figure 5 As shown, the first roller 81 is disposed at the first heat exchange top 351 of the first heat exchanger 31, and the second roller 82 is disposed at the first heat exchange bottom 352 of the first heat exchanger 31. In this way, the defrosting water released by the first roller 81 during the winding process can be sprayed onto the top of the second heat exchanger 32, thereby improving the cleaning effect on the second heat exchanger 32.

[0084] Optionally, the moisture-absorbing module 8 further includes a support abutment 84, which is disposed between the first roller 81 and the second roller 82 and close to the first roller 81. The support abutment 84 is used to abut against the moisture-absorbing element. When the moisture-absorbing element is in the moisture-absorbing state, the moisture-absorbing element includes a first moisture-absorbing part 831 between the first roller 81 and the support abutment 84, and a second moisture-absorbing part 832 between the support abutment 84 and the second roller 82. The included angle between the first moisture-absorbing part 831 and the second moisture-absorbing part 832 is α, and 90° < α < 150°.

[0085] Optionally, the aforementioned absorbent cotton fabric 83 includes a first absorbent portion 831 and a second absorbent portion 832.

[0086] Optionally, the support abutment 84 and the second reel 82 are arranged on the same vertical line, and the first reel 81 is biased toward the direction of the second heat exchanger 32, such as... Figure 5 As shown. Thus, due to the arrangement of the supporting abutment 84, an angle is formed between the first moisture-absorbing part 831 and the second moisture-absorbing part 832 during the winding process. This allows the defrosting water released by the first roll 81 during winding to be better collected into the roll receiving cavity of the spray housing 85 and completely sprayed onto the second heat exchanger 32, preventing it from falling onto the surface of the first heat exchanger 31, thereby improving the cleaning effect on the second heat exchanger 32. Optionally, the included angle α can be 95°, 100°, 110°, 120°, 130°, 140°, or 150°.

[0087] Optionally, the moisture absorption module 8 further includes a spray housing 85, which has a roll receiving cavity inside to accommodate the first roll 81. The spray housing 85 has nozzles 851 facing the second heat exchanger 32. The spray housing 85 has an elastic extrusion member inside to extrude moisture absorption element during the winding process of the first roll 81, causing the moisture absorption element to release defrost water. The defrost water is sprayed onto the second heat exchanger 32 through the nozzles 851 of the spray housing 85 to clean the second heat exchanger 32.

[0088] The elastic extrusion element can be made of a deformable material such as rubber, which is disposed inside the spray housing 85 and does not have a water-absorbing function. In this way, during the winding process of the moisture-absorbing element at the first roll 81, the moisture-absorbing element and the elastic extrusion element exert a squeezing action, which helps to release the defrosting water absorbed by the moisture-absorbing element.

[0089] Optionally, the spray housing 85 has a constricted spray pattern.

[0090] The aforementioned embodiment cleans the second heat exchanger 32 during the self-cleaning process of the first heat exchanger 31. It can be understood that when the second heat exchanger 32 meets the required self-cleaning time, it can also be self-cleaned by first frosting and then defrosting.

[0091] Optionally, when frosting the second heat exchanger 32, a dual evaporation temperature is established. The refrigerant flowing from the compressor 10 is controlled to flow into the indoor heat exchange unit 30 after passing through the outdoor heat exchanger 40. Furthermore, the openings of the first expansion valve 61 and the second expansion valve 62 are adjusted so that the temperature of the second heat exchanger 32 is below 0°C for frosting, while the first heat exchanger 31 cools down but does not frost. The refrigerant flow path is as follows: Figure 3 As shown.

[0092] When the second heat exchanger 32 is defrosted, the refrigerant flowing from the compressor 10 flows into the outdoor heat exchanger 40 after passing through the indoor heat exchange unit 30. In this way, the high-temperature refrigerant discharged from the compressor 10 can defrost the second heat exchanger 32 after it has finished frosting. Figure 4 As shown. Once defrosting is complete, the self-cleaning of the second heat exchanger 32 is finished.

[0093] Optionally, for the first heat exchanger 31, the interval between two consecutive self-cleaning cycles of frosting followed by defrosting can be 500 hours; for the second heat exchanger 32, the interval between two consecutive self-cleaning cycles of frosting followed by defrosting can be 1000 hours, in order to ensure the cleanliness of the heat exchangers.

[0094] Optionally, the compressor 10 includes a first compression cylinder 11 and a second compression cylinder 12. The first compression cylinder 11 has a first suction port, and the second compression cylinder 12 has a second suction port. The first heat exchanger 31 is connected to the second suction port, and the second heat exchanger 32 is connected to the first suction port.

[0095] The compressor 10 is a twin-cylinder compressor, comprising a first compression cylinder 11 and a second compression cylinder 12. The first compression cylinder 11 has a first intake port and a first exhaust port, and the second compression cylinder 12 has a second intake port and a second exhaust port. After being compressed by the first compression cylinder 11 and / or the second compression cylinder 12, the refrigerant flows through the first exhaust port and / or the second exhaust port to the oil separator 20, and then flows to the main refrigerant circulation loop of the air conditioning system. The piping layout of the main refrigerant circulation loop mainly includes a first refrigerant pipe 41, a second refrigerant pipe 42, and a third refrigerant pipe 43, also known as a three-pipe air conditioning system.

[0096] In cooling mode, the refrigerant in the oil separator 20 flows to the outdoor heat exchanger 40 via the four-way valve 33. The refrigerant in the outdoor heat exchanger 40 flows to the second heat exchanger 32 and the first heat exchanger 31 via the third refrigerant line 43 (high-pressure liquid line). Furthermore, the refrigerant in the second heat exchanger 32 flows sequentially to the first return line 44 via the first refrigerant line 41 (low-pressure gas line) and the three-way valve 34, and the refrigerant in the first return line 44 flows to the first compression cylinder 11 (low-pressure cylinder). The refrigerant in the first heat exchanger 31 flows sequentially to the second return line 45 via the second refrigerant line 42 (medium-pressure gas line) and the four-way valve 33, and the refrigerant in the second return line 45 flows to the second compression cylinder 12 (medium-pressure cylinder). Here, port a of the four-way valve 33 is connected to port b, and port c is connected to port d; port g of the three-way valve 34 is connected to port h.

[0097] In heating mode, the refrigerant from the oil separator 20 flows to the first refrigerant line 41 through the three-way valve 34, and the refrigerant from the first refrigerant line 41 flows to the second heat exchanger 32. The refrigerant from the oil separator 20 also flows to the second refrigerant line 42 through the four-way valve 33, and the refrigerant from the second refrigerant line 42 flows to the first heat exchanger 31. Furthermore, the refrigerant from the second heat exchanger 32 and the first heat exchanger 31 merges and flows to the outdoor heat exchanger 40 through the third refrigerant line 43. The refrigerant from the outdoor heat exchanger 40 flows sequentially to the second compression cylinder 12 through the four-way valve 33 and the second return line 45. Here, port a of the four-way valve 33 is connected to port d, and port b is connected to port c; port f of the three-way valve 34 is connected to port g.

[0098] Optionally, in the case of having multiple second heat exchangers 32 and multiple first heat exchangers 31, each second heat exchanger 32 is arranged side by side with one first heat exchanger 31 to form a group of indoor heat exchange units 30. Here, an indoor fan 70 is provided on one side of each group of indoor heat exchange units 30. Furthermore, multiple groups of indoor heat exchange units 30 can be used to install in different spaces.

[0099] Optionally, each heat exchanger is equipped with a corresponding expansion valve, and a system throttling element 63 is provided between the indoor heat exchange unit 30 and the outdoor heat exchanger 40. In this way, through the arrangement and adjustment of multiple throttling elements, the air conditioning system can realize multiple modes in addition to cooling and heating modes, such as reheat dehumidification mode and simultaneous cooling and heating mode.

[0100] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A multi-split air conditioning system, characterized in that, include: Compressor (10); Outdoor heat exchanger (40); The indoor heat exchange module includes an indoor shell and an indoor heat exchange unit (30) disposed in the indoor shell. The indoor heat exchange unit (30) is connected to the outdoor heat exchanger (40) through a third refrigerant pipeline (43). The indoor heat exchange unit (30) includes a first heat exchange unit and a second heat exchange unit. The first heat exchange unit includes a first heat exchanger (31) and a first expansion valve (61) connected to the first heat exchanger (31). The second heat exchange unit includes a second heat exchanger (32) and a second expansion valve (62) connected to the second heat exchanger (32). An economizer (91), installed in the third refrigerant line (43), is used to subcool the refrigerant flowing into the indoor heat exchange unit (30); and, The liquid storage element includes a liquid storage tank (92) and a first liquid storage pipeline (921) and a second liquid storage pipeline (922) connecting the liquid storage tank (92). The first liquid storage pipeline (921) connects the outdoor heat exchanger (40) and the liquid storage tank (92), and the second liquid storage pipeline (922) connects the liquid storage tank (92) and the indoor heat exchange unit (30). The first liquid storage pipeline (921) is connected to the economizer (91) by a first subcooling inflow pipeline.

2. The multi-split air conditioning system according to claim 1, characterized in that, The first liquid storage pipeline (921) includes a first liquid storage pipe section connecting the third refrigerant pipeline (43) and the first subcooling inflow pipeline, and a second liquid storage pipe section connecting the first subcooling inflow pipeline and the liquid storage tank (92). The first liquid storage pipe section is equipped with a first throttling element (93), and the second liquid storage pipe section is equipped with a second throttling element (94).

3. The multi-split air conditioning system according to claim 2, characterized in that, The second liquid storage line (922) is equipped with a third throttling element (95); and, The section of the third refrigerant line (43) between the outdoor heat exchanger (40) and the first liquid storage line (921) is equipped with a system throttling element (63).

4. The multi-split air conditioning system according to claim 3, characterized in that, It also includes a controller, which is configured as follows: Obtain the current subcooling of the outdoor heat exchanger (40). If the current subcooling is less than or equal to the first target subcooling, reduce the opening of the system throttling element (63). If the current subcooling is greater than the first target subcooling and less than or equal to the second target subcooling, then the opening of the first throttling element (93) is reduced so that the low-temperature refrigerant flows into the economizer (91) to subcool the refrigerant in the third refrigerant pipeline (43). If the current subcooling is greater than the second target subcooling, the opening of the third throttling element (95) is reduced so that the low-temperature refrigerant in the liquid storage tank (92) enters the third refrigerant pipeline (43).

5. The multi-split air conditioning system according to claim 4, characterized in that, If the current subcooling is greater than the first target subcooling and less than or equal to the second target subcooling, the method further includes: reducing the opening of the second throttling element (94) and closing the third throttling element (95) to replenish the low-temperature refrigerant in the storage tank (92).

6. The multi-split air conditioning system according to claim 4, characterized in that, If the current subcooling is greater than the second target subcooling, then the opening of the third throttling element (95) is reduced, and the following is also included: If the amount of refrigerant stored in the liquid storage tank (92) is less than or equal to the minimum liquid storage amount, the third throttling element (95) is closed and the opening of the first throttling element (93) is reduced so that the economizer (91) subcools the refrigerant in the third refrigerant pipeline (43).

7. The multi-split air conditioning system according to claim 1, characterized in that, The controller is also configured as follows: The refrigerant flowing out of the compressor (10) flows into the indoor heat exchange unit (30) after passing through the outdoor heat exchanger (40). The opening of the first expansion valve (61) is adjusted to be less than or equal to the first preset opening to frost the first heat exchanger (31). The opening of the second expansion valve (62) is adjusted to be greater than or equal to the second preset opening to reheat the second heat exchanger (32).

8. The multi-split air conditioning system according to claim 7, characterized in that, The controller is also configured as follows: The refrigerant flowing out of the compressor (10) flows into the outdoor heat exchanger (40) after passing through the indoor heat exchange unit (30), causing the first heat exchanger (31) to defrost and clean the first heat exchanger (31).

9. The multi-split air conditioning system according to any one of claims 1 to 8, characterized in that, The compressor (10) includes a first compression cylinder (11) and a second compression cylinder (12), the first compression cylinder (11) having a first intake port and the second compression cylinder (12) having a second intake port. The first heat exchanger (31) is connected to the second air intake, and the second heat exchanger (32) is connected to the first air intake.

10. The multi-split air conditioning system according to claim 9, characterized in that, The first compression cylinder (11) is a low-pressure cylinder, and the second compression cylinder (12) is a medium-pressure cylinder.

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